The Collaborative International Dictionary of English v.0.48:

Catenulate \Ca*ten"u*late\, a. [L. catenuia, dim. of catena
   chain.]
   1. Consisting of little links or chains.
      [1913 Webster]

   2. (Zool.) Chainlike; -- said both or color marks and of
      indentations when arranged like the links of a chain, as
      on shells, etc.
      [1913 Webster]

WordNet (r) 3.0 (2006):

catenulate
    adj 1: having a chainlike form; "catenulate bacterial cell
           colonies" [syn: catenulate, chainlike]
    v 1: arrange in a series of rings or chains, as for spores [syn:
         catenate, catenulate]